Log5 8 + log5 10 - 2log5 20
Using logarithmic laws, we can simplify the expression as:
log5 (8*10/20^2)
= log5 (80/400)
= log5 (1/5)
= log5 5^-1
= -1
Therefore, log5 8 + log5 10 - 2log5 20 = -1.
log5 (8*10/20^2)
= log5 (80/400)
= log5 (1/5)
= log5 5^-1
= -1
Therefore, log5 8 + log5 10 - 2log5 20 = -1.